[build] Don't include sanitizer AOT runtimes for musl-libc

Closes #62151

GitOrigin-RevId: cb16ab5
Change-Id: I20902c5a09c766c13d31de59d214a62cc6357c9a
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/465800
Reviewed-by: Ryan Macnak <[email protected]>
Commit-Queue: Slava Egorov <[email protected]>

Author: ntkme

sdk/BUILD.gn

@@ -18,6 +18,12 @@ import("../build/executable_suffix.gni")
 import("../sdk_args.gni")
 import("../utils/application_snapshot.gni")
 
+# If we're are embedded in another GN buildroot, such as Flutter, the sysroot
+# might already be imported from elsewhere.
+if (get_path_info(".", "abspath") == "//sdk/") {
+  import("../build/config/sysroot.gni")
+}
+
 declare_args() {
   # Build a SDK with less stuff. It excludes dart2js, ddc, and web libraries.
   dart_platform_sdk = true
@@ -379,10 +385,11 @@ copy_sanitizer_deps = []
 # If the default toolchain is already using a sanitizer, the sanitizer variant
 # toolchains will try to use multiple sanitizers at the same time, which
 # doesn't work. If we're not on Linux, the sanitizers are not statically linked
-# and not useable outside our tree. If we're are embedded in another GN
-# buildroot, such as Flutter, the sanitizer variant toolchains might not be
-# defined.
+# and not useable outside our tree. If we're on Linux with musl-libc, the
+# sanitizers don't work. If we're are embedded in another GN buildroot, such as
+# Flutter, the sanitizer variant toolchains might not be defined.
 if (!using_sanitizer && current_os == "linux" &&
+    !(defined(dart_sysroot) && dart_sysroot == "alpine") &&
     get_path_info(".", "abspath") == "//sdk/") {
   sanitizers = []
   if (current_cpu == "x64" || current_cpu == "arm64") {